# Is this a bug?

**URL:** <https://forum.makecode.com/t/is-this-a-bug/6279>\
**Category:** Help\
**Created:** [February 19, 2021, 4:40pm UTC](https://forum.makecode.com/t/is-this-a-bug/6279 "2021-02-19T16:40:05Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Agent\_14](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/agent_14/32/17567_2.png) [@Agent\_14](https://forum.makecode.com/u/Agent_14)\
**Post date:** [February 19, 2021, 4:40pm UTC](https://forum.makecode.com/t/is-this-a-bug/6279/1 "2021-02-19T16:40:05Z")

</div>

So when I was using the tilemaps extension, for some reason when I switch to JavaScript and return, it turns the tilemap blocks into gray blocks. Also, when I switch back to blocks from JavaScript, sometimes it either collapses all blocks, or opens up the ones I had collapsed.