Copper golem is invisible when spawned in using spawn egg, however the spawn egg also has no texture and is also invisible.
This also applies to the copper golem statue too.
Similar to the sniffer mob when they added that, it took a very long time for us to actually see the sniffer.
Thank you for your report!
We're tracking this issue in MCPE-223989, so this ticket is being resolved and linked as a duplicate.
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