clear decoder pool after spawn

[DmitryRomanov]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.22%. Comparing base (67ecc39) to head (3bdfef8). Report is 38 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #677      +/-   ##
==========================================
+ Coverage   70.83%   72.22%   +1.38%     
==========================================
  Files         124      137      +13     
  Lines       12572    13928    +1356     
==========================================
+ Hits         8906    10059    +1153     
- Misses       3150     3306     +156     
- Partials      516      563      +47     

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