Add table entries size setting like state table size
Ifa lot of data is loaded into a persist table, they can exhaust pf's default table entry limits easily.
On 2.0 it defaults to 200,000 (1.2.3 was 100,000) but can be set higher by an entry like this in the pf ruleset:
set limit table-entries 500000
More information here:
That page suggests that 100,000 is only necessary as a maximum if you have less than 100MB of RAM, otherwise it can be increased.