Classes not resolved after upgrade to 2026-06 M1 (4.40.0 M1)

[Steve-BookingLive]

Describe the bug
After update to 2026-06 all of my Class references are marked 'ClassName cannot be resolved to a type'.

Describe the eclipse environment
product-id org.eclipse.epp.package.php.product
bundle-id org.eclipse.epp.package.php
bundle-version 4.40.0.20260409-0737
java.vendor Eclipse Adoptium
java.version 21.0.10

Describe your system

• OS: Ubuntu
• Version: 24.04.4 LTS

To Reproduce
Steps to reproduce the behaviour:

1. Upgrade to 2026-06
2. See all class references marked 'ClassName cannot be resolved to a type'

Expected behaviour
Class references should not be marked, and F2 should bring up dialogue and allow opening of Class definition.

Additional context
A 'Clean' of the project seems to fix the issue.
I had similar issues on last release candidate upgrade, see #295