Can not load text data from ML.Net formatted file

**System Information**
- Model Builder Version: 16.1.0.2041102
- Visual Studio Version: 16.6.5

**The bag**

My data looks like:
```
#@ TextLoader{
#@ header+
#@ sep=tab
#@ col=Signal:TX:0
#@ col=Features:R4:1-13
#@ }
Signal 13 0:""
A 5.18318939 7.15346956 -2.17563128 -0.73105526 -5.266888 1.53642082 -2.5065968 0.673678041 -2.15960288 -0.59014225 -0.0943836346 0.799055755 1.63462913
A 5.498637 9.607026 -0.5584643 -0.0328068 -3.16750336 2.07753539 -1.43945122 0.4845428 -1.4946686 -0.169637516 0.7250544 2.36166024 0.497059882
A 3.996713 11.7442684 1.47274029 0.0203783289 -2.41468763 3.58536744 -3.14649081 2.43419576 -0.339808732 0.72464025 -0.0729868561 0.8280493 -0.120707527
A 2.67490387 12.8288279 -0.206502244 1.45496285 1.17160869 -1.95037043 -3.38032174 1.82436979 0.610646546 -1.488981 -0.06361399 0.788708448 0.351375878
A 5.30536747 8.270027 -2.740677 1.41013825 -2.654548 2.299344 -1.65489733 0.7302742 -2.18515658 -1.39530623 0.8179908 1.97329521 -0.116933838
A 0.579052746 9.369362 -0.340619415 1.0491215 -3.72689939 3.48625636 -0.710082 1.97451723 0.0125530474 0.270270258 -1.08870339 1.16362035 0.6432678
A 2.17444062 12.5961065 0.21108067 2.12631655 0.877906144 -0.401404172 -1.015385 1.27959609 -0.4173578 -0.781255066 0.304535717 2.30834246 -0.202794492
A 3.30898833 13.313899 -1.68393946 1.661705 -1.33209419 1.2256918 -3.991646 1.98770607 -4.016889 0.935438037 0.00443459675 1.95483315 0.629864335
A 2.96511436 12.5907974 0.514994 1.14698339 0.400934458 -0.478516728 -0.53402257 1.267731 -0.721033454 -0.7496938 0.2800758 0.567380369 -1.0322051
```

And when I try to load it I get error:
```
Data ErrorInput array is longer than the number of columns in this table.
at System.Data.DataTable.NewRecordFromArray(Object[] value)
at System.Data.DataRowCollection.Add(Object[] values)
at Microsoft.ML.ModelBuilder.ToolWindows.DataTabDataContext.<>c__DisplayClass140_0.<b__0>d.MoveNext()
```
The text file was created with `mlContext.Data.SaveAsText(dataView, fs);`