Ah, this seems to be yet another problem. I didn’t try it with more than 1 additional addresses, so i didn’t have this issue.
This problem was already acknowledged and fixed upstream, see check_icmp: Failed to resolve multiple addresses
This bug apparently is present in CMK 2.0 up until 2.0.0p5 and should be fixed in 2.0.0p6. You can however apply the fix to line 62 to your version of check_icmp as seen in the Commit here: 12897 FIX check_icmp: Failed to resolve multiple addresses · tribe29/checkmk@f1d1c26 · GitHub
Then it should also work on your site and that problem should be fixed in the next version.
But the problem with $HOST_ADDRESSES_4 will probably still be present in the next version…
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