So I discovered a bug for the bug boss where in it's second form (the flying form), the boss suddenly glided into the ceiling and I was softlocked.
I have the same bug with ceiling. After some time boss came back. But the game crashed after my victory.
ERROR in
action number 1
of Step Event0
for object oShockWave:
Unable to find instance for object index 41
at gml_Object_oShockWave_Step_0
#########################
gml_Object_oShockWave_Step_0 (line -1)