Use int value to compare and check if LTS version

extensions/ter_fe2/Classes/Service/LTSVersionService.php

@@ -281,7 +281,7 @@ class LTSVersionService
     public function isVersionLTS(int $versionNumber): bool
     {
         $firstRelease = $this->getFirstReleaseOfMainVersion($versionNumber);
-        $mainVersion = $firstRelease / self::FACTOR_MAIN_VERSION;
+        $mainVersion = floor($firstRelease / self::FACTOR_MAIN_VERSION);
 
         return ($mainVersion >= self::FIRST_LTS_VERSION_WITH_MAIN_VERSION_NUMBER && $mainVersion <= $this->getLatestDevelopmentVersion()) || in_array($firstRelease, $this->ltsVersionsWithMinorVersions, true);
     }