Error in dropNTSC algorithm

There is an error in the below SMPTE Time algorithm:
TTML Semantics - Time Expressions and SMPTE Time Relationship


S = (countedFrames - droppedFrames + (subFrames / subFrameRate)) / effectiveFrameRate

where

countedFrames = (3600 * hours + 60 * minutes + seconds) * frameRate + frames

hours, minutes, seconds, frames, subFrames components are extracted from time expression if present, or zero if not present;

droppedFrames is computed as follows:

1. let dropMode be the computed value of the ttp:dropMode parameter;

2. if dropMode is dropNTSC, let droppedFrames = (hours * 54 + floor(minutes - minutes/10)) * 2;

3. otherwise, if dropMode is dropPAL, let droppedFrames = (hours * 27 + floor(minutes/2 - minutes/20)) * 4;

4. otherwise, let droppedFrames = 0;

frameRate is the computed value of the ttp:frameRate parameter;

subFrameRate is the computed value of the ttp:subFrameRate parameter;

and effectiveFrameRate (in frames per second) is frameRate * frameRateMultipler where frameRate is the computed value of the ttp:frameRate parameter and frameRateMultipler is the computed value of the ttp:frameRateMultiplier parameter.

Notwithstanding the above, if a time expression contains a frame code that is designated as dropped according to 6.2.3 ttp:dropMode<http://www.w3.org/TR/ttaf1-dfxp/#parameter-attribute-dropMode>, then that time expression should be considered to be invalid for purposes of validation assessment.


2. if dropMode is dropNTSC, let droppedFrames = (hours * 54 + floor(minutes - minutes/10)) * 2;
should be:
2. if dropMode is dropNTSC, let droppedFrames = (hours * 54 + minutes - floor(minutes/10)) * 2;

This can be clearly seen in the case of 00:01:00:03, which obviously has 2 frames dropped.
In the original algorithm: floor(1 - 1/10)*2 -> floor(1 - 0.1)*2 -> floor(0..9)*2 -> 0*2 -> 0
In the modified algorithm: (1 - floor(1/10))*2 -> (1 -floor(0.1))*2 -> (1-0)*2 -> 1*2 -> 2

And I assume:
3. otherwise, if dropMode is dropPAL, let droppedFrames = (hours * 27 + floor(minutes/2 - minutes/20)) * 4;
should be:
3. otherwise, if dropMode is dropPAL, let droppedFrames = (hours * 27 + floor(minutes/2) - floor(minutes/20)) * 4;