I'm not here to ask why the bullets don't do damage to royal minis, but this is peculiar.
The bottom-right arena room in the Sovereign Slime: Red Carpet Runaround spawns both royal and green minis, and while spamming bombs in the corner I noticed that the Green Minis got hit by the bullets, while the Royal ones didn't.
If the minis are too short to be hit by the bullets, then why do Green minis get hit? They have less health so are presumably even shorter, so... yes.
Is this a bug, or was this done to make the DR far less effective in the RJP boss fight after its nerf to make it not totally OP? Thoughts below.
Minis are borked in general. OOO will fix this at their standard bug-fixing rate, which means we can expect everything to be in order by 2028.