TYPO3 Core

I have made this fix.
I'm not in the loop on how this is done the right way, as we seldom contribute this way...
Hope someone can help me getting this fixed...

/Stig

Index: public/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- public/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php    (date 1564755837000)
+++ public/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php    (date 1564755837000)
@@ -459,7 +459,14 @@
             try {
                 $folder = $storage->getFolder($fileMountIdentifier);
             } catch (FolderDoesNotExistException $e) {
-                $storage->createFolder($fileMountIdentifier);
+                //Fix to make sure that the folder is create correctly when using groupHomePath https://forge.typo3.org/issues/88895
+                if(strpos(str_replace(':/',':', $storage->getRootLevelFolder()->getCombinedIdentifier()), $GLOBALS['TYPO3_CONF_VARS']['BE']['groupHomePath']) === 0) {
+                    $groupHomeFolder = $storage->getRootLevelFolder();
+                    $groupHomeFolder->createFolder(str_replace($storage->getRootLevelFolder()->getIdentifier(),'', '/'. $fileMountIdentifier));
+                } else {
+                    if(strpos($allowedFileMount, $GLOBALS['TYPO3_CONF_VARS']['BE']['groupHomePath']) === 0) continue;
+                    $storage->createFolder($fileMountIdentifier);
+                }
                 continue;
             } catch (InsufficientFolderAccessPermissionsException $e) {
                 continue;

@susanne.moog
When does this Coding Night take place?

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62415

Patch set 3 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62415

Patch set 4 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62415

Patch set 5 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62415

Patch set 1 for branch 9.5 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/62400