Looks like the upstream module is broken, 1.3.x works fine (Server version: Apache/2.4.34 (Unix)), requests fail with:

      [Tue Aug 07 17:10:09.581297 2018] [authz_core:debug] [pid 52857] mod_authz_core.c(817): [client 127.0.0.1:52007] AH01626: authorization result of Require all granted: granted, referer: http://127.0.0.1:8989/
      [Tue Aug 07 17:10:09.581505 2018] [authz_core:debug] [pid 52857] mod_authz_core.c(817): [client 127.0.0.1:52007] AH01626: authorization result of <RequireAny>: granted, referer: http://127.0.0.1:8989/
      [Tue Aug 07 17:10:09.581541 2018] [:debug] [pid 52857] mod_proxy_cluster.c(1725): proxy: byrequests balancer skipping BAD worker
      [Tue Aug 07 17:10:09.581554 2018] [:debug] [pid 52857] mod_proxy_cluster.c(1725): proxy: byrequests balancer skipping BAD worker
      [Tue Aug 07 17:10:09.581564 2018] [:debug] [pid 52857] mod_proxy_cluster.c(1820): proxy: byrequests balancer FAILED
      [Tue Aug 07 17:10:09.581578 2018] [:error] [pid 52857] proxy: CLUSTER: (balancer://mycluster). All workers are in error state
      

            [MODCLUSTER-660] mod_proxy_cluster master broken

            Jean-Frederic Clere added a comment - Fixed by https://github.com/modcluster/mod_proxy_cluster/commit/00443f704bfb9df9208fccaa9089b8fd878b4dae

              rhn-engineering-jclere Jean-Frederic Clere
              rhn-engineering-rhusar Radoslav Husar
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