In my testing on a Pico W i can publish a short message to

a/b/c/d/e/mqtt just fine
but not
sensors/blinktaeller/28cdc101dd54/mqtt_as

it publishes
1 repubs: 0 outages: 0 free: 149600 just fine

but not
{"msg": "0 repubs: 0 outages: 0 free: 153392", "ring_buffer": [[1, 1609459449470], [2, 1609459450652], [3, 1609459451452], [4, 1609459452058], [5, 1609459452646], [6, 1609459454092], [7, 1609459454721], [8, 1609459455818], [9, 1609459456859], [10, 1609459456892], [11, 1609459456996], [12, 1609459457071], [13, 1609459457120], [14, 1609459457196], [15, 1609459457243], [16, 1609459457306], [17, 1609459457336], [18, 1609459457366], [19, 1609459457475], [20, 1609459457576], [21, 1609459457612], [22, 1609459457694], [23, 1609459457801], [24, 1609459457863], [25, 1609459457897], [26, 1609459457930], [27, 1609459457963], [28, 1609459458058], [29, 1609459458117], [30, 1609459458157], [31, 1609459458247], [32, 1609459458357], [33, 1609459458464], [34, 1609459458538], [35, 1609459458567], [36, 1609459458639], [37, 1609459458700], [38, 1609459458769], [39, 1609459458832], [40, 1609459458918], [41, 1609459459001], [42, 1609459459104], [43, 1609459459141], [44, 1609459459222], [45, 1609459459293], [46, 1609459459338], [47, 1609459459374], [48, 1609459459457], [49, 1609459459527], [50, 1609459459628], [51, 1609459459665], [52, 1609459459697], [53, 1609459459735], [54, 1609459459786], [55, 1609459459864], [56, 1609459459891], [57, 1609459459992], [58, 1609459460051], [59, 1609459460105], [60, 1609459460132], [61, 1609459460236], [62, 1609459460292], [63, 1609459460329], [64, 1609459460418], [65, 1609459460498], [66, 1609459460556], [67, 1609459460651], [68, 1609459460741], [69, 1609459460809], [70, 1609459460878], [71, 1609459460979], [72, 1609459461036], [73, 1609459461126], [74, 1609459461149], [75, 1609459461235], [76, 1609459461304], [77, 1609459461409], [78, 1609459461444], [79, 1609459461497], [80, 1609459461574], [81, 1609459461608], [82, 1609459461708], [83, 1609459461792], [84, 1609459461856], [85, 1609459461937], [86, 1609459461972], [87, 1609459462027], [88, 1609459462097]]}

it publises the first, then tries no 2, but after a while it says wifi down and reconnects without continuing the publish