[1400:1400:0527/220418.678349:ERROR:content/renderer/render_frame_impl.cc:2206] POC[renderer]: intercepted Unload on inner-delegate placeholder; injecting child + sending DidUnloadRenderFrame without swap
[1400:1400:0527/220418.688421:ERROR:content/renderer/render_frame_impl.cc:2217] POC[renderer]: DidUnloadRenderFrame sent; gc1 NOT detached
[1232:1232:0527/220418.701923:ERROR:content/browser/renderer_host/render_frame_host_impl.cc:7161] POC[browser]: OnUnloadACK inner-delegate branch: is_render_frame_deleted=1 inner_tree_main_frame_tree_node_id=5 children_.size()=1
[1232:1232:0527/220418.701950:ERROR:content/browser/renderer_host/render_frame_host_impl.cc:7168] POC[browser]: *** INVARIANT VIOLATION ***
POC[browser]:   placeholder RFH render_frame_state=kDeleted AND inner_tree_main_frame_tree_node_id is set (5) AND children_.size()=1
POC[browser]:   child[0] lifecycle=Active is_render_frame_created=1 parent()==placeholder=1 parent()->is_render_frame_deleted=1
[1232:1232:0527/220418.701974:FATAL:content/browser/renderer_host/render_frame_host_impl.cc:7180] POC[browser]: kDeleted inner-delegate placeholder retains 1 live child FTN(s) because OnUnloadACK omitted ResetChildren()