HUD and dialog windows not displaying

Issue description

Dialog windows (e.g. "Are you sure you want to exit?" or "Choose a save game to load" or "Choose where to save your game" or "Enter your character's name") and the HUD are not visible in the game.

For example:

• In the main menu, when I click "Load", the text "Load" greys out as if selected, but I do not see a dialog window from which I can select the save to load. Despite this, I can press Enter to load a save as if the dialog window were there.
• After loading a game, when I press Esc and click "Exit", the text "Exit" greys out as if selected, but I do not see a dialog window asking me to confirm my action. Despite this, pressing the left arrow and then Enter successfully exits the game.

Interestingly, the "Settings" dialog window does work.

There are no errors in my openmw.log. Triggering the bug as described above does not result in any new log entries.

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Version information

OS	Debian Testing (Trixie)
OpenMW	v0.48 (Debian repository, package 0.48.0-1)
Morrowind	Steam version, English, with Tribunal and Bloodmoon

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Solutions I have (not) tried

• I previously played OpenMW v0.47 without these issues, but I'm not sure how to install that version to check out if the issues are also present there.
• The issue does not occur when launching Morrowind from Steam with Proton Experimental. (Without OpenMW, that is.)
• I have removed all my settings, mods, and saves, then apt purge openmw openmw-data openmw-launcher'd OpenMW before reinstalling, validated my Steam installation, but even then the issue persists.