# Known Issues Umbraco UI Builder strives to closely mimic the content pipeline while adhering to public and supported APIs. This ensures full compatibility with the Data Type suite for property editing. However, some features in the Umbraco Core rely on internal methods, making full support for certain functionalities challenging. Below is a list of known issues. ## Property Editors ### Tags While Umbraco UI Builder supports persisting tag values, it currently does not write these tags to the `cmsTags` database table. This functionality is managed by the internal `tagsRepository`, which is not publicly accessible, preventing direct saving in the same manner as Umbraco Core. ### Block Editors Block Editors (Block List/Block Grid) are not currently supported due to casting errors between the JSON string representation and collection property. An implementation to address this is investigated and will be scheduled for a future major release. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.umbraco.com/umbraco-ui-builder/known-issues.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.