Error: layers[26].filter[2][2][0]: expected one of [==, !=, >, >=, <, <=, in, !in, all, any, none]

[bean-fidhleir]

Apologies if this isn't the best place for this.

Trying to do a quick-and-dirty test of the full strength, I unpacked the USA.mbtiles to z/x/y .pbf files, added a "tiles:" line rather than a "url:", and inserted the positron .json file in place of the original style used for the countries in index.html:

<script> // mapboxgl.accessToken = 'pk.your-own-code-here-for-online-maps'; mapboxgl.accessToken = 'NOT-REQUIRED-WITH-YOUR-VECTOR-TILES-DATA';

var mappath = "http://momcat/Maps/TILES" ;
var style = {
"version": 8,
"name": "Positron",
"metadata": {
"mapbox:autocomposite": false,
"mapbox:type": "template",
"mapbox:groups": {
"b6371a3f2f5a9932464fa3867530a2e5": {
"name": "Transportation",
"collapsed": false
},
"a14c9607bc7954ba1df7205bf660433f": {
"name": "Boundaries"
},
"101da9f13b64a08fa4b6ac1168e89e5f": {
"name": "Places",
"collapsed": false
}
},
"openmaptiles:version": "3.x",
"openmaptiles:mapbox:owner": "openmaptiles",
"openmaptiles:mapbox:source:url": "mapbox://openmaptiles.4qljc88t"
},
"center": [
10.184401828277089,
-1.1368683772161603e-13
],
"zoom": 0.8902641636539237,
"bearing": 0,
"pitch": 0,
"sources": {
"openmaptiles": {
"type": "vector",
// "url": "https://free.tilehosting.com/data/v3.json?key={key}"
"tiles": ["http://momcat/Maps/TILES/{z}/{x}/{y}.pbf"]
}
},
"sprite": "https://openmaptiles.github.io/positron-gl-style/sprite",
"glyphs": "https://free.tilehosting.com/fonts/{fontstack}/{range}.pbf?key={key}",
"layers": [
{
"id": "background",
"type": "background",
"paint": {
"background-color": "rgb(242,243,240)"
}
},
...usw.

Opening the index page with firebug turned on, I see that the 3 GETs succeeded, but then it halted with the error msg in the title line before it did more than put the controls onto the screen.

The expansion is:
Style/r</< http://momcat/Maps/mapbox-gl.js:114:610
forEach self-hosted:251:13
Style/r< http://momcat/Maps/mapbox-gl.js:114:582
bound self-hosted:919:17
bound bound self-hosted:1000:17

I've no clue whether it's a bug in the GL code, a bug in the tile, or some dopey error I made in modifying the index file.