WMTS layer max zoom isn't detected by Josm

[StephaneP]

What steps will reproduce the problem?

1. Add a WMTS source with a max zoom higher than 20
2. Add this imagery to Josm
3. Zoom in

What is the expected result?

Josm should display the images with the max zoom available from the source

What happens instead?

Josm doesn't load tiles with a zoom higher than 20

Please provide any additional information below. Attach a screenshot if possible.

A workaround is to set the default TMS maxzoom to a higher value which is limited to 24.

The same WMTS source is ok in Qgis

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2023-03-14 22:49:24 +0100 (Tue, 14 Mar 2023)
Revision:18693
Build-Date:2023-03-15 02:30:57
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18693 en) Windows 11 64-Bit
OS Build number: Windows 10 Pro 2009 (22621)
Memory Usage: 1840 MB / 16384 MB (649 MB allocated, but free)
Java version: 19.0.1+10-21, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920×1200 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1200
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: UTF-8
System property sun.jnu.encoding: Cp1252
Locale info: en_FR
Numbers with default locale: 1234567890 -> 1234567890
Dataset consistency test: No problems found

Plugins:
+ DirectUpload (35951)
+ ImportImagePlugin (36013)
+ MakeParallel (v1.1.0)
+ Mapillary (2.1.1)
+ OpeningHoursEditor (35924)
+ PicLayer (1.0.2)
+ PolygonCutOut (v0.7.3)
+ alignways (36011)
+ apache-commons (36034)
+ apache-http (35924)
+ areaselector (1652822522)
+ austriaaddresshelper (master-4e80dc2e4261d321150187f4951684ad97342d5e)
+ cadastre-fr (36021)
+ centernode (v1.0.4)
+ changeset-viewer (0.0.6)
+ continuosDownload (105)
+ contourmerge (v0.1.9)
+ editgpx (36054)
+ ejml (35924)
+ geotools (36028)
+ imagery-xml-bounds (35976)
+ jackson (36034)
+ jaxb (35952)
+ jna (36005)
+ jts (36004)
+ log4j (36034)
+ lwjgl (36034)
+ lwjgl-windows (36034)
+ mbtiles (v2.6.1)
+ opendata (36025)
+ photo_geotagging (35933)
+ photoadjust (36011)
+ reltoolbox (35976)
+ reverter (36043)
+ shrinkwrap (v1.0.4)
+ tageditor (36011)
+ todo (123)
+ turnlanes-tagging (v0.0.5)
+ turnrestrictions (36011)
+ undelete (36011)
+ utilsplugin2 (36011)

Tagging presets:
+ D:\Gares21\gares21\JOSM\Gares21-preset.xml

Map paint styles:
- H:\Gares21\gares21\JOSM\railway-station.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://raw.githubusercontent.com/species/josm-preset-traffic_sign_direction/master/direction.mapcss
+ C:\Users\Stephane\Documents\GitHub\MapCSS-JOSM-Bicycle\cycleway.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/iD&zip=1
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/NewHighwayColors&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksPlus&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/BesideTheRoad_Speed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Sidewalks&zip=1

Validator rules:
+ D:\Gares21\gares21\JOSM\railway-station.validator.mapcss

Last errors/warnings:
- 00016.399 E: Failed to locate image 'presets/frame.png'
- 00016.400 W:  Indoor area: Could not get presets icon presets/frame.png
- 00016.401 E: Failed to locate image 'presets/frame.png'
- 00016.402 W:  Indoor wall: Could not get presets icon presets/frame.png
- 00016.402 E: Failed to locate image 'presets/platform_rail.png'
- 00016.403 W:  Quai ferroviaire: Could not get presets icon presets/platform_rail.png
- 00016.405 E: Failed to locate image 'styles/standard/transport/ticket-machine.png'
- 00016.406 W:  Food vending machine: Could not get presets icon styles/standard/transport/ticket-machine.png
- 03388.845 W: No default layer selected, choosing first layer.
- 13235.874 W: No default layer selected, choosing first layer.