Your question refers to 14 CFR 61.39(a)(6)(i):
The answer, in my opinion, can be found in 14 CFR 61.43(f)(3) which states:
(f) If a practical test is discontinued, the applicant is entitled credit for those areas of operation that were passed, but only if the applicant:
(1) Passes the remainder of the practical test within the 60-day period after the date the practical test was discontinued;
(2) Presents to the examiner for the retest the original notice of disapproval form or the letter of discontinuance form, as appropriate;
(3) Satisfactorily accomplishes any additional training needed and obtains the appropriate instructor endorsements, if additional training is required; and
(4) Presents to the examiner for the retest a properly completed and signed application.
(emphasis is mine)
Assuming that your test was "discontinued" (not a pass nor a failure) due to weather, mechanical issues, etc., a "Letter of Discontinuance" is issued by the examiner. And, as noted in the sample Letter of Discontinuance shown below, it does not extend the expiration date for the required instructor endorsements.
Here is a sample of a "Letter of Discontinuance" from FAA Order 8900.2C - General Aviation Airman Designee Handbook, Figure 7-12.
(emphasis and highlights are mine)