With window-extension, is there a limit to the number of swf panels that can be opened?

I installed some other people's extensions, including some I made myself. There are twenty or thirty swf panels in total.
Then after creating a new document, the swf panel cannot be opened through window-extension, there is no response to clicking, not all of them cannot be opened, and some phenomena that cannot be opened will randomly appear.
Is there a limit to the number of files in windowSWF? If not, why are there some that won't open in the windows extension?
The version I used to make the test is 2021