Purging the cache in phpBB 3.2.0 on PHP 7.0 causes HTTP 500 error which is gone after several page reloads.

The error text looks like:
[Mon May 15 07:22:21.560948 2017] [cgi:error] [pid 10637] [client *.*.*.*:50802] End of script output before headers: php, referer: https://domain.com/
[Mon May 15 07:47:53.865120 2017] [cgi:error] [pid 19677] [client *.*.*.*:56083] AH01215: *** Error in `/opt/php70/bin/php-cgi': malloc(): smallbin double linked list corrupted: 0x0000000002cb9e70 ***
[Mon May 15 07:47:53.865743 2017] [cgi:error] [pid 19677] [client *.*.*.*:56083] End of script output before headers: php
[Mon May 15 07:48:07.950537 2017] [cgi:error] [pid 19805] [client *.*.*.*:56156] AH01215: *** Error in `/opt/php70/bin/php-cgi': munmap_chunk(): invalid pointer: 0x00007f9f72c698e2 ***

Random deleting cache files gave the result that HTTP 500 error raises after deleting the s9e_renderer cache file, like s9e_renderer_b6be1796cd7dd1aa72151bc47f370952ae9a5e87.php.

Setting the php.ini directive pcre.jit to 0 solves the issue. Also, setting the $configurator->rendering->engine->enableQuickRenderer = true; to false in /phpbb/textformatter/s9e/factory.php solves the issue as well.

@JoshyPHP