<div dir="ltr"><div style="font-size:small" class="gmail_default">> This is a known bug in the Topology-Preserving Simplfier.  For instance see<br>> <a href="https://github.com/locationtech/jts/issues/428">https://github.com/locationtech/jts/issues/428</a><br>> <br>> I'll add your example to the ticket.  Hopefully this can be fixed sometime<br>> soon.<br></div><div style="font-size:small" class="gmail_default">Thanks!</div><div style="font-size:small" class="gmail_default"><br></div><div style="font-size:small" class="gmail_default">And what about ST_MakeValid converting that hole into an outerring instead of just discarding it?</div><div style="font-size:small" class="gmail_default">Is that something that's worth a discussion?</div><div style="font-size:small" class="gmail_default"><br></div><div style="font-size:small" class="gmail_default">Paul<br></div><br></div>