this is what it looks like rendered
there should be color but for some reason not.
Okay I changed each texture to opaque. but the colors still havenât changed to what the colors should be
And you can see it look how it should here
actually, it looks pretty cool, like an impossible shape!
You need to switch from the evee render engine to the cycles render engine.
Thats what I have it on, and eevee does the same
Another way this might help (just discovered it today) is to go into the material tab and change the âblend modeâ from"alpha blend" to âopaqueâ
This should fix the problem in both evee and cycles
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Yes thank you, that helped with the color, but doesnât help with the objects being transparent when imported, I asked a friend and he said it may be due to unions, so iâm going to check that.
(edit: I just rememberd it also happened with a normal roblox brick)
(Edit 2: I just updated to the latest version of blender (3.0) and the same thing is happening)
Aha.
The solution is pretty simple.
Go to the Material Properties tab in the Properties editor and under the âViewport Displayâ submenu open the settings sub-submenu and change the Blend Mode from Alpha Blend to Opaque.
Edit: My apologies @Xenonic_778 also replied with this solution just below my original post. 
Edit2: The other option is the disable the âShow Backfaceâ checkbox in the same menu.
Use that method instead if a material needs to be slightly transparent.
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Yea, Iâve done that, but I usually wouldnât need to do that or manually add the colors.
Also i think theres 100+ textures, meaning i have to set those all to opaque manually, and do the colors when It would usually do it for me (this is now version 3.0)
Edit: Is there anyway to have it automatically set to opaque?
I donât think so.
Itâd require a script but Iâm afraid I donât know enough python to do that for you.
Cycles doesnât have this issue with alpha blending, can you use that?
How to do it:
Have the build selected.
Go to the plus in the corner
Click âGeneralâ
Click âShadingâ
Scroll down/zoom out at the bottom.
Then drag the line from ânormalâ to âclearcoat normalâ
Itâs done! To go back, just press the âDefaultâ tab at the top!
Hope this helped! 
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Sadly it did not work. Iâm hoping I can get this fixed soon
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Are you using evee or cycles? You have to use cycles for it.
Yes, I am using cycles, I rarely ever use eevee
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Ok. I do not know to help, then.
Hereâs what you have to do 
Go into the materials tab, select your object, open it up even further and see the texture inside it.
Go to material tab > settings > blend mode > opaque
Transparent object
Select in outliner
open up and select the inner thing
Open up the inner thing and select the material inside it
Go to the materials tab
Settings tab
See how Blend mode is âAlpha Blendâ
Change blend mode to âopaqueâ
Problem solved!!
Evee
Cycles
I really hope this helps. If it doesnât then something really is wrong.
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Yes, Iâve been told plenty of times but usually this wouldnât happen and color would also show up