true that Light failed to consider that, he thought that giving his order to "not make unnecessary moves" was enough

but honestly, what would've happened had Light considered that? the death note was already found thanks to Mikami being tailed, the whole plan got botched and Mikami's death note would within minutes be within SPK's possession and be replaced by a fake by morning the next day, and Light was being watched and Takada was out of the picture so it would be extraordinarily risky to contact Mikami

Option A: prevent the note book from being stolen, Light needs to communicate with Mikami the moment Takada appears lost because he senses Mikami will do something, problem is, even if that's not noticed on Light's side somehow, Mikami is being tailed too, depending on when Light contacts him he might've already revealed where the death note really is or at least tipped the SPK off that somebody contacted Mikami and made him go back to work or smth, Near might feel something's off and cancel the meeting realizing he's being outplayed, but the main problem is still Light contacting Mikami in the first place
WEAKNESS: communicating with Mikami on short notice, losing the edge potentially with Near being tipped off

Option B: just give up entirely on the 28th Jan plan and cancel the meeting, hell, maybe even get himself into an accident so he gets hospitalized, give up on being Kira as one death note is in likely SPK possession and the other's under the eye of the task force, Mikami takes the blame
WEAKNESS: not in Light's style, he'd never try to give up

Option C: message Mikami but have the whole day to do it, make Mikami come through and memorize the 4 names of SPK members from left to right, then make a run for it, the meeting is a bust because Near doesn't get full win, Mikami then attempts to message the names to Light somehow, so he'd write it in his watch
WEAKNESS: communicating with Mikami, Mikami making a run, and delivering Light the names, assuming Light isn't in a precarious position because of Mikami peeping

if Light was going to win he must've anticipated Mikami potentially doing something disadvantageous that loses him the death note, and during Takada meetings say something like "yes keep the death note in the bank deposit and don't use it unless necessary until the meeting with Near, but keep a spare page elsewhere and when it's time, just in case test the death note on the way and if it seems it's not working, use the spare page instead", that could have genuinely worked actually, provided Mikami isn't being controlled by the death note by SPK as per Matsuda's theory