Not sure if this is an expected or unexpected regression, but the following dot no longer renders as expected:
digraph structs {
node [shape=plaintext]
struct1 [label=<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
<TR><TD>left</TD><TD PORT="f1">mid dle</TD><TD PORT="f2">right</TD></TR>
</TABLE>
>];
struct2 [label=<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
<TR><TD PORT="f0">one</TD><TD>two</TD></TR>
</TABLE>
>];
struct3 [label=<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
<TR>
<TD ROWSPAN="3">hello<BR/>world</TD>
<TD COLSPAN="3">b</TD>
<TD ROWSPAN="3">g</TD>
<TD ROWSPAN="3">h</TD>
</TR>
<TR>
<TD>c</TD><TD PORT="here">d</TD><TD>e</TD>
</TR>
<TR>
<TD COLSPAN="3">f</TD>
</TR>
</TABLE>
>];
struct1:f1 -> struct2:f0;
struct1:f2 -> struct3:here;
}
See: Graphviz / Gordon Smith | Observable (observablehq.com)