Text filter no longer available in Filters list with GPU tratment

As the first example about key frames used the text filter, I tried to reproduce it, but the filter was no longer available in the complete video filters list.
I deleted the Metytech folder, uninstalled/re-installed Shotcut (cleaning previous Registry settings) re-imported a backup of my presets folder, and the filter was back.
But I finally discovered that it would disappear as soon as I activated the GPU treatment.
Is this text filter incompatible with GPU treatment?

Yes, the text filter does not work with GPU processing.

Anybody knows if this will be solved anytime soon?

Probably not. No plans to work on this anytime soon. GPU processing is experimental, and improving it is not a priority for any developers.