I seem to have a problem with setting up the game on Doomsday correctly. No matter what options I choose, every time I open a minimap, none is drawn on the screen, and result is a black screen. Closing the minimap causes the HUD to disappear and the Pause Menu not to render at all. It remains functional, as well as the gameplay. I can eg. load or quit the game by blind picking.
Any hints how to solve that? The game is nearly unplayable without the minimap.

Alternatively, is there a better source port to use?

I've played thru Hexen on Crispy Hexen engine. Crispy is basically Chocolate Doom/Hexen/Heretic, but with some added QoL improvements most importantly the doubled resolution. I had to build Crispy manually bc Hexen support was shoddy and the authors disabled it in their builds, but as I'm googling now, Hexen's fortunes in Cripsy have turned https://www.doomworld.com/forum/topic/67168-crispy-doom-5111-update-feb-10-2022/

Thanks a lot! I'm going to give it a try.

I also recommend reading the topics below:

https://www.gog.com/forum/heretic_hexen_collection/heretic_and_hexen_1_sourceports

https://www.gog.com/forum/heretic_hexen_collection/running_hexen_deathkings_of_the_dark_citadel_in_chocolate_hexen

The instructions for setting up Chocolate Hexen also apply to Crispy Hexen as well, since Crispy Hexen is a variant of Chocolate Hexen.