See Feature 43 "Position of tense, aspect, and mood markers in relation to the verb" for discussion of a possible exception in the speech of one informant, who seems to allow some temporal adverbs to intervene between preverbal markers and the verb.
Here we see that the irrealis markers sa and ma appear between the past tense marker wa and the verb.
I treat auxiliaries (including the negative resultative auxiliary, which incorporates a negative element) as verb forms; in other words, auxiliaries do not count as elements which intervene between the tense marker and the verb.
Source: Kouwenberg 2007: 32
Source: Kouwenberg 2007: 32