PNG file created by photoshop beta will not open in photoshop or lightroom : "invalid chunk type" ?

[cryanhorner]

photoshop beta 25.12

macos sonoma 14.6

i have a .psb file with 9 layers, each of them is essentially just a different color/version of the same composition, so I'm exporting each of them as it's own .png file and giving it a little parenthetical subtitle to keep track.

now for some reason 1 of the 9 is giving me this strange error i've never seen before.  it appears to export just fine, but i cannot import the .png file into lightroom and i cannot re-open it in photoshop (regular or beta) (or in preview which just shows a black rectangle), i recieve the error message shown below.  the .psb file itself seems fine though, the image looks as expected when i close/re-open that file and i get no error during the export, only when trying to open the newly created .png do i have a problem.

(photoshop)

 

(lightroom)

 

now i have no idea why this one .png export from the same photoshop file would be treated any differently from any of the other 8 that work fine, but it's driving me nuts.  i have tried deleting and re-exporting the file, tried with and without the "transparency" box checked.  some people in other threads have said things like, change it to a .jpeg instead, but that insn't a solution that's a clunky work-around, and I don't want to just have one file from a project be in lossy format for no reason when the rest are not.  i can't find any info on this error though so no idea how to address it.  what even is a chunk, i've never heard of that before?

has anyone else experienced this issue, and if so, were you able to find any real solution for it besides just not being allowed to export in the file type that you want?  thanks for anyone's expertise here, i feel like, unfortunately (i know it's a beta) but the frequency of errors and glitches and things that just stop my work in its tracks have been so much more frequent lately with photoshop and i'm not sure why that is 😕

[CoryShubert]

Hi @cryanhorner would it be possible to share the file so we can test it here?  If so, send to shubert@adobe.com

Thanks,

Cory - Photoshop Product Manager

[cryanhorner]

Hi Cory, I would be happy to share the .png file that prompted the error in the original post, but am not sure how to do so here.  It is a very large file, according to the screenshot above it is over 300mb.

I was going to try to export a smaller version for you, but in an exciting new development, the entire .psb file is now giving me the error message shown below.  I tried and failed to open it in either standard or beta photoshop today, despite not touching the file at all since yesterday when it was opening just fine.  I opened/closed/exported from this .psb file without any errors yesterday when trying to figure out why the .png issue was happening and didn't see anything like this message.

[CoryShubert]

@cryanhorner we see you are on MacOS, can you use TimeMachine and rollback to yesterday on your machine and see if you are able to recover the file that way?

If you do, you can use Dropbox or GoogleDrive or whatever cloud setup you have to share the file with shubert@adobe.com

Thanks,

Cory - Photoshop Product Manager

[cryanhorner]

Good morning Cory,

You know, I really am at a loss to explain what's going on now.  I was intending on taking your suggestion to try to access an earlier save state of the .psb file, but I though oh what ther heck, I'll just try to open the damaged one one more time first, and having done nothing to it since I last posted, the file just opened normally without the error prompt.

I was pretty excited by that development, so I figured I'd try to export that single layer .png again, this time at 10% size to have a version I could share more easily with you to review, and that worked without issue, so I decided to try again at 100%, and actually this time the 100% size .png file that I exported is working normally.  I was able to open that one in both preview and then in photoshop, and the thumbnail looks normal (vs the grey square I was seeing before).

The thing is, I didn't do anything to solve the issue, so I'm confused still since I don't know if something I did caused the problem in the first place, which I could try to avoid in the future, or why it went away without any corrective action.

It's great news and I'm glad that the whole project that I thought had been destroyed is now back, but no idea what was going on before really, and of course now that the problem has magically fixed itself, I'm not able to duplicate it for you for the purpose of investigation.

I areally ppreciate your time and effort though.

[CoryShubert]

Thanks for the update @cryanhorner we are glad things are working and if you have this issue again, please let us know in case we can repeat it and see why it happend.

Thanks,

Cory - Photoshop Product Manager