TYPO3 Core

Still an issue. Manually adjusting the slug in the database works, as expected.

I can confirm the issue.

Our setup:

• default lang: de / no language slug
• overlay: en / en as language slug

If I go the root page (in default language - pid 1) and click "recalculate URL segment", the slug changes from "/" to "/1"

By changing Web/typo3/sysext/core/Classes/DataHandling/SlugHelper.php

to

    public function isUniqueInSite(string $slug, RecordState $state): bool
    {
        $pageId = $state->resolveNodeAggregateIdentifier();
        $recordId = $state->getSubject()->getIdentifier();
        $languageId = $state->getContext()->getLanguageId();

        if (!MathUtility::canBeInterpretedAsInteger($pageId)) {
            // If this is a new page, we use the parent page to resolve the site
            $pageId = $state->getNode()->getIdentifier();
        }
        $pageId = (int)$pageId;

        if ($pageId < 0) {
            $pageId = $this->resolveLivePageId($recordId);
        }

        $queryBuilder = $this->createPreparedQueryBuilder();
        $this->applySlugConstraint($queryBuilder, $slug);
        $this->applyRecordConstraint($queryBuilder, $recordId);
        $this->applyLanguageConstraint($queryBuilder, $languageId);
        $this->applyWorkspaceConstraint($queryBuilder);
        $statement = $queryBuilder->execute();

        $records = $this->resolveVersionOverlays(
            $statement->fetchAll()
        );
        if (count($records) === 0) {
            return true;
        }

        // The installation contains at least ONE other record with the same slug
        // Now find out if it is the same root page ID
        $siteMatcher = GeneralUtility::makeInstance(SiteMatcher::class);
        $siteMatcher->refresh();
        $siteOfCurrentRecord = $siteMatcher->matchByPageId($pageId);
        foreach ($records as $record) {
            try {
                $recordState = RecordStateFactory::forName($this->tableName)->fromArray($record);
                $siteOfExistingRecord = $siteMatcher->matchByPageId(
                    (int)$recordState->resolveNodeAggregateIdentifier()
                );
            } catch (SiteNotFoundException $exception) {
                // In case not site is found, the record is not
                // organized in any site or pseudo-site
                continue;
            }
            if ($siteOfExistingRecord->getRootPageId() === $siteOfCurrentRecord->getRootPageId()) {
                if ($pageId === (int)$recordState->getNode()->getIdentifier()) {
                    // if we are on the same page, we can skip it and return true
                    return true;
                } else {
                    return false;
                }
            }
        }

        // Otherwise, everything is still fine
        return true;
    }

I added this if statement:

                if ($pageId === (int)$recordState->getNode()->getIdentifier()) {
                    // if we are on the same page, we can skip it and return true
                    return true;
                } else {
                    return false;
                }