I tried to create a range partition on a table (11G in size) by first calling create_range_partitions with partition_data set to false. It created 10 partitions and added pathman_table_number_11_check on them
Then I tried running partition_table_concurrently and got this error:

PG::InternalError: ERROR: constraint "pathman_table_1_14_check" for partition "table_1" does not exist
HINT: pg_pathman will be disabled to allow you to resolve this issue

Constraint id is being calculated incorrectly in this case.