Last 3 Travis jobs after merge are always ignored

Description

After introducing gcc-8 tests we have up to 27 Travis jobs. Jobs 25-27 are always ignored.
An example at https://travis-ci.org/percona/percona-server/jobs/389135060 :

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Created June 11, 2018 at 2:27 PM
Updated July 2, 2018 at 4:03 PM
Resolved June 12, 2018 at 9:53 AM