Redmine Computable Custom Field

1- Test
create custom field "p", integer --> OK
create custom field "i", integer --> OK
create custom field "pxi", integer, computable sum() --> it's not working

2- Test combi matrix
create custom field "probability", key/value--> OK
create custom field "impact", key/value--> OK
create custom field "combi", combi matrix, computable mapping() --> it's not working

Environment:
Redmine version 4.2.4.stable
Ruby version 2.6.9-p207 (2021-11-24) [x64-mingw32]
Rails version 5.2.6.2
Environment production
Database adapter Mysql2
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
SCM:
Git 2.35.1
Filesystem
Redmine plugins:
redmine_base_deface 1.6.2
redmine_colored_enumeration 0.1.1
redmine_computable_custom_field 3.0.3
redmine_matrix_field 0.1.1