VS2026: Crashes when re-opening solution that previously had a .xeto file open

[ktwrd]

When re-opening a solution that previously had a .xeto file open, it seems to crash. ActivityLog.xml doesn't provide much information.

<entry>
  <record>331</record>
  <time>2025/11/27 08:05:53.953</time>
  <type>Error</type>
  <source>VisualStudio</source>
  <description>SetSite failed for package [EtoAddinPackage](null)</description>
  <guid>{BBAB498D-6FDF-44A3-83EE-A17F909DBF14}</guid>
  <hr>0x80131534</hr>
  <errorinfo></errorinfo>
</entry>

The .xeto file was a Form that had all standard controls in it, except a custom control (which was showing as placeholder text, which is intended for previewing .xeto files, and it was fine before I closed VS2026).

Visual Studio Version: 18.0.2 (2026)
Eto: 2.10.2
Platform: Eto.Wpf, 2.10.2
Target Framework: net10.0-windows7

[ktwrd]

VS2026 is now crashing when opening a .xeto file no matter what.

Everything is the same as before, except that I'm now on VS2026 18.1.1.

Last two entries in ActivityLog.xml were:

  <entry>
    <record>796</record>
    <time>2026/01/19 02:10:47.560</time>
    <type>Information</type>
    <source>VisualStudio</source>
    <description>Begin package load [EtoAddinPackage]</description>
    <guid>{BBAB498D-6FDF-44A3-83EE-A17F909DBF14}</guid>
  </entry>
  <entry>
    <record>797</record>
    <time>2026/01/19 02:10:47.647</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>SetSite failed for package [EtoAddinPackage](null)</description>
    <guid>{BBAB498D-6FDF-44A3-83EE-A17F909DBF14}</guid>
    <hr>0x80131534</hr>
    <errorinfo></errorinfo>
  </entry>