(EDIT: same as #1399 latest comments, but that issue is closed)
I just downloaded a clean 2022-12 JEE package from Eclipse.org and installed it
(eclipse-jee-2022-12-R-macosx-cocoa-aarch64.dmg)
when I tried to add the GRECLIPSE snapshot 4.26 update site and install it, I got:

Cannot complete the install because of a conflicting dependency.
Software being installed: Eclipse Groovy Development Tools 4.8.0.v202212121946-e2212 (org.codehaus.groovy.eclipse.feature.feature.group 4.8.0.v202212121946-e2212)
Software currently installed: Eclipse IDE for Enterprise Java and Web Developers 4.26.0.20221201-1200 (epp.package.jee 4.26.0.20221201-1200)
Software currently installed: Eclipse Java Development Tools 3.18.1400.v20221123-1800 (org.eclipse.jdt.feature.group 3.18.1400.v20221123-1800)
Only one of the following can be installed at once:
Java Development Tools Core 3.32.0.v202212121946-e2212 (org.eclipse.jdt.core 3.32.0.v202212121946-e2212)
Java Development Tools Core 3.32.0.v20221108-1853 (org.eclipse.jdt.core 3.32.0.v20221108-1853)
Java Development Tools Core 3.31.0.v20220831-1439 (org.eclipse.jdt.core 3.31.0.v20220831-1439)
Cannot satisfy dependency:
From: Eclipse IDE for Enterprise Java and Web Developers 4.26.0.20221201-1200 (epp.package.jee 4.26.0.20221201-1200)
To: org.eclipse.equinox.p2.iu; org.eclipse.epp.package.common.feature.feature.group [4.26.0.20221201-1200,4.26.0.20221201-1200]
Cannot satisfy dependency:
From: Groovy-Eclipse Compilerless feature 4.8.0.v202212121946-e2212 (org.codehaus.groovy.compilerless.feature.feature.group 4.8.0.v202212121946-e2212)
To: org.eclipse.equinox.p2.iu; org.codehaus.groovy.headless.feature.feature.group [4.8.0.v202212121946-e2212,4.8.0.v202212121946-e2212]
Cannot satisfy dependency:
From: Eclipse Groovy Development Tools 4.8.0.v202212121946-e2212 (org.codehaus.groovy.eclipse.feature.feature.group 4.8.0.v202212121946-e2212)
To: org.eclipse.equinox.p2.iu; org.codehaus.groovy.compilerless.feature.feature.group [4.8.0.v202212121946-e2212,4.8.0.v202212121946-e2212]
Cannot satisfy dependency:
From: Groovy-Eclipse Headless feature 4.8.0.v202212121946-e2212 (org.codehaus.groovy.headless.feature.feature.group 4.8.0.v202212121946-e2212)
To: org.eclipse.equinox.p2.iu; org.codehaus.groovy.jdt.patch.feature.group [4.8.0.v202212121946-e2212,4.8.0.v202212121946-e2212]
Cannot satisfy dependency:
From: Eclipse Packaging Project Common Feature 4.26.0.20221201-1200 (org.eclipse.epp.package.common.feature.feature.group 4.26.0.20221201-1200)
To: org.eclipse.equinox.p2.iu; org.eclipse.jdt.core [3.32.0.v20221108-1853,3.32.0.v20221108-1853]
Cannot satisfy dependency:
From Patch: org.codehaus.groovy.jdt.patch.feature.group 4.8.0.v202212121946-e2212 Eclipse Java Development Tools 3.18.1400.v20221123-1800 (org.eclipse.jdt.feature.group 3.18.1400.v20221123-1800)
To: org.eclipse.equinox.p2.iu; org.eclipse.jdt.core [3.32.0.v202212121946-e2212,3.32.0.v202212121946-e2212]
(EDIT: same as #1399 latest comments, but that issue is closed)
I just downloaded a clean 2022-12 JEE package from Eclipse.org and installed it
(eclipse-jee-2022-12-R-macosx-cocoa-aarch64.dmg)
when I tried to add the GRECLIPSE snapshot 4.26 update site and install it, I got:
