Repeatedly lighting and breaking a nether portal causes mass zombified piglin spawning

When a nether portal is broken and replaced in quick succession then pigmen will spawn on mass, producing vast quantities of gold very quickly.

This issue relates to the issue MCPE-97973 and this is where MCPE-97973 originated from.

I have submitted this under the "Private" category as idk whether this classes as a dupe/exploit.

 

This tends to work best with larger portals (in my tests i used c.20x20) portals. About 2-7 pigmen spawn a second when using observer clocks and trapdoors to break the portal.