While using ASA on transparent mode, i tried to apply access-list for layer 2 (ethertye), suddenly the ASA start sending BPDU on the switch port and by sequence the switch blocked the interface on the assigned VLAN. I tried the same on ASA, transparent mode and trunk interface (sub interfaces) and multiple contexts, i didn't see the same issue.

Any idea about this issue?

How to apply L2 ACL on transparent mode and access mode interfaces.