Can't edit files via web interface

When I try to change the file through the web interface, page is loading for a few seconds, after which an error is displayed: 7:permission denied

The only error i see is this lines in gitaly log (root/auth is the project i working on):

2020-06-13T18:12:54.462820694+02:00 {"error":"rpc error: code = PermissionDenied desc = permission denied","grpc.code":"PermissionDenied","grpc.meta.auth_version":"v2","grpc.meta.client_name":"gitaly-ruby","grpc.meta.deadline_type":"none","grpc.method":"RepositoryExists","grpc.request.fullMethod":"/gitaly.RepositoryService/RepositoryExists","grpc.request.glProjectPath":"root/auth","grpc.request.glRepository":"project-6","grpc.request.repoPath":"@hashed/e7/f6/e7f6c011776e8db7cd330b54174fd76f7d0216b612387a5ffcfb81e6f0919683.git","grpc.request.repoStorage":"default","grpc.request.topLevelGroup":"@hashed","grpc.service":"gitaly.RepositoryService","grpc.start_time":"2020-06-13T16:12:53Z","grpc.time_ms":0.092,"level":"warning","msg":"finished unary call with code PermissionDenied","peer.address":"10.42.0.62:37046","pid":10,"span.kind":"server","system":"grpc","time":"2020-06-13T16:12:53.552Z"}
2020-06-13T18:12:54.462820694+02:00 {"correlation_id":"rmtgfHHrxq1","diskcache":"48623cde-0378-472c-8c72-a8b0e22e7cce","grpc.meta.auth_version":"v2","grpc.meta.client_name":"gitlab-web","grpc.meta.deadline_type":"regular","grpc.method":"UserCommitFiles","grpc.request.deadline":"2020-06-13T16:13:16Z","grpc.request.fullMethod":"/gitaly.OperationService/UserCommitFiles","grpc.service":"gitaly.OperationService","grpc.start_time":"2020-06-13T16:12:21Z","level":"info","msg":"diskcache state change","peer.address":"10.42.1.16:54538","pid":10,"span.kind":"server","system":"grpc","time":"2020-06-13T16:12:53.554Z"}
2020-06-13T18:12:54.462820694+02:00 {"correlation_id":"rmtgfHHrxq1","error":"rpc error: code = PermissionDenied desc = permission denied","grpc.code":"PermissionDenied","grpc.meta.auth_version":"v2","grpc.meta.client_name":"gitlab-web","grpc.meta.deadline_type":"regular","grpc.method":"UserCommitFiles","grpc.request.deadline":"2020-06-13T16:13:16Z","grpc.request.fullMethod":"/gitaly.OperationService/UserCommitFiles","grpc.service":"gitaly.OperationService","grpc.start_time":"2020-06-13T16:12:21Z","grpc.time_ms":32036.783,"level":"warning","msg":"finished streaming call with code PermissionDenied","peer.address":"10.42.1.16:54538","pid":10,"span.kind":"server","system":"grpc","time":"2020-06-13T16:12:53.554Z"}

Mine gitlab version is 13.0.3, installed with helm chart

Everything was fine yesterday, no restarts was performed before bug appears, pod restarts are not solving this issue