Quake3e
                                
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                        Some weird colorful lightmaps on the floor
I'm running Vulkan renderer using two days old Quake3e code from master branch. Hardware is Intel KabyLake NUC, Mesa3D 21.2.4.
Please check the screenshot below:

Thank you!
Try with \r_mergeLightmaps 0, this looks very similar to #68
Yes, it fixes the lightmap issue.
Please check also OpenGL build on maps like lun3dm5
Unfortunately I can't. It is running under QNX, we have OpenGL ES and Vulkan there only, no OpenGL.
Try with most recent sources