3.2.0 MariaDB Connector/J (the same noticed with 3.0.3) shows regression in using clearBatch() for parameterized statements. This worked fine in 2.7.2. I'm attaching Java app to reproduce and results using both versions.

//

present - incorrect
Driver version: 3.2
Driver name: MariaDB Connector/J
Driver version name: 3.2.0
Database product name: MariaDB
Database product version name: 10.5.5-MariaDB
Database product version number: 10.5
JDBC version number: 4.2

Table created
Commit the batch
Roll back
Commit the batch
===========
1, XB1
2, XB2
3, XB3
4, XB4
5, XB5
===========
Table dropped