So it appears that you can open 1/10/50… if you have less than (or equal to?) 50 keys. Is there any chance we can just get this “less than 50” check can just be changed to to “less than 1000”? Then the “high amount” chests can be 1/50/200 at a time or whatever basically. That would probably be satisfactory for now until this can be properly fixed.
Basically instead of:
If you have less than or equal to 50 keys of this type, display options 1, 10, 50; else display options 1/50/200 (or whatever the “high amount” ends up being)
Make it:
If you have less than or equal to 1000 keys of this type, display options 1, 10, 50; else display options 1/50/200 (or whatever the “high amount” ends up being)