side chain bug ?

for some reason i cant find the all side chain options
for example
when i open hallion 6 and try side chain to another vst (while you have around 8 fx channel and around 12 buss channles )
it wont let me find vst to side chain to hallion, becase you cant scroll down the side chain list. due to many side chain options.

when i try the same thing but with no fx channels and no buss channels in the project it finds easily the side chain i was looking

is it bug?

I don’t think so