In water, flowing water, and certain waterlogged blocks, your spawn point won't be obstructed. This doesn't happen with any other dangerous blocks.
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pine1needle
This report should be set to community consensus because I was able to reproduce it as part of MC-189579.
Avoma
Can confirm in 21w03a.
Avoma
Can confirm in 1.19.
TheMightyDark
This relates to MC-273848, as valid spawn points underwater could end up being the world spawn.
TheMightyDark
There could be check for an active conduit which is in range of the affected spawn point.
COMETC2021A1
In 24w33a.
AMGAMES04
i cannot reproduce in 24w40a
COMETC2021A1
Can still confirm in 1.21.2-pre1.
gaspoweredpick