fix: fix the deadlock when TermOnErr & Preemptive set together

[lawlielt]

fix the deadlock when TermOnErr & Preemptive set together

[umputun]

TestErrorSizedGroup_Term causing deadlock

[lawlielt]

fixed

[coveralls]

Pull Request Test Coverage Report for Build 5052455845

• 10 of 10 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 95.092%

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Totals
Change from base Build 4671223540:	0.3%
Covered Lines:	155
Relevant Lines:	163

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💛 - Coveralls