Map Viewer Classic will no longer be available as of the first quarter of the 2026 update of ArcGIS Online. See more details here: https://www.esri.com/arcgis-blog/products/arcgis-online/announcements/map-viewer-classic-roadmap-for-retirement.
This issue could not be reproduced with the latest version of ArcGIS Experience Builder on ArcGIS Online and will not be addressed at this time. If the issue persists, please contact Esri Support Services for further assistance.