Experience orbs make blocks like ice essentially invisible when looking through them.
Note that the translucency of experience orbs is an intentional feature and should be kept - see MC-163034.
Linked issues
relates to 7
MC-161898
Transparent particles make other particles behind them invisible
Resolved
MC-165957
Block hitboxes are rendered transparent again
Resolved
MC-165966
Shadows do not render behind experience orbs
Resolved
MC-166359
Experience orbs do not render behind other experience orbs when viewed from certain angles
Open
MC-168485
Chests do not render behind experience orbs
Resolved
2 more links
Fixed in 20w22a