ArriRAW HDE compatibility in Premiere 25.6 and 26.1 (beta) is broken

When ArriRAW HDE footage (from Alexa35) is imported, some clips appear with different (longer) durations.

HP Z8 G4/Dual Xeons/Windows 10/Nvidia RTX A5000/footage on mirrored WD NvME's.
Turning on/off hardware acceleration makes no difference.
No number of clearing caching/database/restarts solves the issue.
No extra panels, no plug-ins.

The "extra fictional" duration of the clips causes of course "Frame substitution recursion attempt aborting after multiple attempts/inserting black" errors. Up to the real duration of the clip, play/decode is ok. When the playhead reaches the "extra" frames, all hell breaks loose: failed transcodings on Media Encoder, errors on Premiere and After Effects.

For example: a clip loaded in After Effects (by the way, problematic clips do load successfully), appears as having a duration of 2381 frames. After a few moments the clip changes duration and now has a duration of 2477 frames. The actual real duration of the clip, on the ARRI Reference Tool is shown as being 2313 frames!

Here is another example of the properties of the same clip shown on Premiere and the ARRI Reference Tool on the same workstation.
arriHDE.jpg

Re-downloaded the footage twice, to verify that it is not, some sort of file corruption.
Tried on a second workstation (again with Premiere v25.6 and v26.1 beta), same issue.
The issue is global and happens on Premiere, Media Encoder v25.6 and After Effects v25.6

Loading the same "problematic" .MXF files, on the ARRI Reference Tool, on the same workstation, results in proper clip durations, flawless playback and transcodings. (tried transcoding to Prores4444XQ and Prores422 LT for proxies with no issues).

For some reason Premiere/AE/Media Encoder, cannot interrogate some .MXF files correctly, thus the wrong calculated clip durations and all the issues that follow.

Wasted three whole days troubleshooting.
I'm done.

Theodoros