Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.100.0-insider

In an HTML file, if one does

<script>
window.
</script>

There will be IntelliSense autocomplete after the dot. Similarly, it also works with single and double quoted type=module:

<script type="module">window.</script>
<script type='module'>window.</script>

However, when doing

<script type=module>window.</script>

There is no autocomplete at all. Using the bare quote less attribute value is valid HTML, so this should be supported.