Yes. Periods of work performed inside the United States are not counted toward the required year of continuous employment abroad, and lengthy or frequent US work can interrupt the continuity of that year. Add up the days before setting a filing date.
Count the days south of the border
The qualifying year must be spent working outside the United States for the qualifying company. Brief US visits do not disqualify an applicant, but the days spent working there are excluded from the count, and a pattern of extended US work can mean the year was never continuous. Hypothetical example: over the past eighteen months the Lake Country planner spent a total of ten weeks supervising panel installations for Montana builders; those ten weeks are subtracted, and the company must show that the remaining Canadian service still adds up to a continuous year within the three-year window.
There is a further question of whether those trips were lawful without work authorisation, which the company should review with advice before describing them in a petition. Going forward, keep the planner in Canada until the petition is filed and approved, and send a different employee or use remote support for any urgent US installation issues. A careful day count now avoids an unfixable defect later.