cannot login to wordpress backend with modpagespeed enabled — CyberPanel - WebHosting Control Panel for OpenLiteSpeed

cannot login to wordpress backend with modpagespeed enabled

Provider: Hetzner Online

System: Centos 7.6


Replace JS/CSS files to JS Delivr?
Install Memcached extension for PHP?
Install LiteSpeed Memcached?
Install Memcached?

activate mod_pagespeed in httpd_config.conf
with official parameters:

pagespeed on
pagespeed InPlaceResourceOptimization off
pagespeed FetchHttps enable
pagespeed FileCachePath /tmp/lshttpd/pagespeed/
pagespeed EnableFilters remove_comments
pagespeed EnableFilters local_storage_cache
pagespeed EnableFilters extend_cache_pdfs
pagespeed EnableFilters combine_css
pagespeed EnableFilters rewrite_css
#pagespeed EnableFilters extend_cache,rewrite_images
#pagespeed EnableFilters rewrite_javascript
#pagespeed FileCacheSizeKb 102400
#pagespeed FileCacheCleanIntervalMs 3600000
#pagespeed FileCacheInodeLimit 500000000
pagespeed FetcherTimeoutMs 5000
#pagespeed ModifyCachingHeaders off
#pagespeed MapProxyDomain
#pagespeed RunExperiment on
#pagespeed EnableFilters inline_images
#pagespeed LoadFromFile /usr/lsws/lsws/admin/html/
#pagespeed LoadFromFile /usr/local/lsws/Example/html/

cannot login to wordpress backend
the login form is not responded to, no error logs either
frontend is working with SSL

unset and restart OLS removes the problem

SSL is set, firewall off, mod security off

another lean config:
pagespeed on
pagespeed FileCachePath /tmp/lshttpd/pagespeed
pagespeed RewriteLevel CoreFilters

results in the same problem

2019-01-02 17:54:36.517039 [ERROR] [182.53.YYY:52801:HTTP2-1] pCache is NULL, pInfo is 0x14c45f0, pReq is 0x14c4110, pPath is (nil).
2019-01-02 17:59:37.289140 [INFO] [182.53.YYY:52801:HTTP2-1] Connection idle time too long: 301 while in state: 6 watching for event: 8449, close!
2019-01-02 17:59:37.289371 [INFO] [182.53.YYY:52801:HTTP2-1] Content len: 146, Request line:
POST /wp-login.php HTTP/1.1


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