MacOS Tahoe language switching shortcut

On MacOS Tahoe the language switching Shortcuts is broken for me.

When i'm trying to switch languages with the comb ⌘ + space, sometimes the language is switching back by himself!

• I cant reach the next language with the comb (I checked all other Shortcuts, nothing there)
• The only way to actually miss this bug is to press the fn (the globe key)
• After pressing the fn button, this bug is disappearing

For info:

• I checked all setting like Auto-switch language for documents, etc
• I don't use special tools which could do this

Specs:

• MacOS Tahoe Version 26.1 (25B78)
• Apple M1 Pro