strange coordinates after parser mapbox pbf

[yasongguo]

Hello,
I am trying to make vector tile base on Mapbox pbf standard.

First, convert data from EPSG4326 to EPSG3857 and export as .json.
Second, use mapbox/tippecanoe to generate vector tile in pbf format
Third, use mapbox/pbf, @mapbox/vector-tile and zlib, and use toGeoJSON
Finally, I got the following results

geojson { type: 'Feature',
geometry:
{ type: 'LineString',
coordinates: [ [Array], [Array], [Array], [Array], [Array] ] },
properties:
{ FNODE_: 27,
TNODE_: 27,
LPOLY_: 9,
RPOLY_: 1,
LENGTH: 1.567,
HYD1_4M_: 278,
HYD1_4M_ID: 1454,
GBCODE: 23010,
NAME: '濂庡悲娌',
LEVEL_RIVE: 5,
LEVEL_LAKE: 1 } }

and in the coordinates:
[ -48.427734375, 74.74118495548183 ]
[ -48.7353515625, 74.78737860165961 ]
[ -48.6474609375, 74.74118495548183 ]
[ -48.4716796875, 74.71803680830911 ]
[ -48.427734375, 74.74118495548183 ]

this coordinate is very strange, the origin data is in EPSG4326 and I convert the data in EPSG3857,
but the above data is obviously not EPSG4326 or EPSG3857.

Does anyone know why this is?
Thanks in advance

[yasongguo]

Code error caused by my own negligence, close this issue.
Thank you very much for developing this tool, it is very easy to use.