Can't paste custom OPLL patches beyond the first in custom OPLL mode

[galap-1]

I've discovered a bug involving the custom OPLL mode: In module properties, if "use external OPLL" is checked, you can paste patch data into the fields of the OPLL patches. However, when you press OK, the data you paste in is only retained if it was pasted into the Patch 1 slot. Anything pasted into the other 17 slots will just revert to the default and not get saved.